Enhancement of superconductivity by the small size effect in In nanoparticles

W. H. Li, C. C. Yang, F. C. Tsao, S. Y. Wu, P. J. Huang, M. K. Chung, Y. D. Yao

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The superconducting parameters of zero-dimensional In nanoparticles were studied by measuring the magnetic susceptibility, electrical resistivity, and specific heat. Significant alternations of the superconducting parameters were found for particles with diameters smaller than 120nm. The Anderson regime, where superconductivity was sharply suppressed by the discrete nature of the electronic levels, was seen for particle smaller than 7.5nm. A regime prior to the Anderson one, in which superconductivity was found to vary in accordance with alternations of the structural parameters, due to the small size effect, was also observed and characterized. A nonignorable 5% increase in TC and a 400 times higher HC were seen for the 39nm particles. The appearance of this regime was closely related to the structural symmetry of the system.

Original languageEnglish
Article number214516
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number21
StatePublished - 1 Dec 2005


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